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Old 28th March 2008, 07:40 AM   #1
xyz9915 is offline xyz9915  Pakistan
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Question Selection of proper wire for Ferrite core

Please help me that how do I determine proper wire size in SMPS for building a ferrite core transformer.
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Old 28th March 2008, 10:12 AM   #2
areza is offline areza  Bangladesh
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use as thick as possible , always try to keep the frequency low , for 15-50 khz use one single wire , above 75khz try to use several thin cluster of wire, try to use foil if its a big "E I" shape core and if its only few turns ,
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Old 29th March 2008, 06:56 PM   #3
Tolik is offline Tolik  Israel
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Quote:
use as thick as possible
what about skin effect looses ?

http://www.bcae1.com/trnsfrmr.htm
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Old 31st March 2008, 03:57 PM   #4
areza is offline areza  Bangladesh
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unavoidable effect if the frequency is 50khz and up and if its a 500w up design, dont really worry about skin effect cos my favourite frequency is 25khz, bmax +- 1000 to 1500, never had a problem with this settings, till now i manage to smoke some fuse and some wire but no fets,
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Old 31st March 2008, 06:00 PM   #5
cerrem is offline cerrem  United States
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Default Re: Selection of proper wire for Ferrite core

Quote:
Originally posted by xyz9915
Please help me that how do I determine proper wire size in SMPS for building a ferrite core transformer.
You choose wire size by current density such as Circular Mills per Ampere... 500cm/A to 800cm/A is the general range, since you always lean towards the higher, provided you can fit it...
Once you determine the wire size in cm for the given current.. You then look at the switching frequency skin effect.... Which is usually always a factor... You then divide up the Circular Mills you choosen into more smaller wires in parallel that also add up to same cm....The wire gauge you choose is based on the skin effect.... For example # 27AWG is the largest single wire you want to use with 200kHz based on skin effect...

Chris
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